扫描简单动画

ImageView mQrLineView = (ImageView) findViewById(R.id.scan_line);
        TranslateAnimation mAnimation = new TranslateAnimation(TranslateAnimation.ABSOLUTE, 0f,
                TranslateAnimation.ABSOLUTE, 0f, TranslateAnimation.RELATIVE_TO_PARENT, 0f,
                TranslateAnimation.RELATIVE_TO_PARENT, 0.9f);
        mAnimation.setDuration(1500);
        mAnimation.setRepeatCount(-1);
        mAnimation.setRepeatMode(Animation.RESTART);
        mAnimation.setInterpolator(new LinearInterpolator());
        mQrLineView.setAnimation(mAnimation);

<RelativeLayout
        android:id="@+id/box_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerHorizontal="true"
        android:background="#000">

        <ImageView
            android:id="@+id/scan_line"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_margin="5dp"
            android:background="@drawable/line" />
    </RelativeLayout>